每条推讯都是一个JSON文件，除了推讯本身的内容外还包含大量的元数据：日期和时间，跟帖者数量，账户创立日期，地理数据，等等。
Each tweet is a JSON file, containing an immense amount of metadata in addition to the contents of the tweet itself: date and time, number of followers, account creation date, geodata, and so on.
为了保证动物实验的结果外推的人类之一最终过程的合理性及有效性，选用恰当的动物模型是研究者首先应该考虑的问题。
It demands us to recognize the characteristics of every animal and animal model in order to select appropriate models for our study.
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